windows 10 port forwarding 445

Port 445 is used by Windows File Sharing services by default. If you use netstat with the -o -b flags, you'll receive something like:

  TCP    0.0.0.0:445            0.0.0.0:0              LISTENING       4
 Can not obtain ownership information

where the 4 at the end of first line is the PID. You can see a similar question about the message Can not obtain ownership information on Stack Overflow and on Super User.

You can free up the port by disabling NetBT service by following the Microsoft's help article here.

To disable NetBIOS on the DHCP server, follow these steps:

• Click Start, point to Programs, point to Administrative Tools, and then click DHCP.

• In the navigation pane, expand the server_name, expand Scope, right-click Scope Options, and then click Configure Options.

  Note In this step, the server_name placeholder specifies the name of the DHCP server.

• Click the Advanced tab, and then click Microsoft Windows 2000 Options in the Vendor class list.

• Make sure that Default User Class is selected in the User class list.

• Click to select the 001 Microsoft Disable Netbios Option check box, under the Available Options column.

• In the Data entry area, type 0x2 in the Long box, and then click OK.